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834821e3b6
Clean up small, surprising bits of code This PR clean up a small number of unrelated, small things I found while browsing the code base.
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc dev guide: